<html>
<head>
	<meta charset="UTF-8">
    <style>
    * {
        padding: 0;
        margin: 0;
        box-sizing: border-box;
    }
    .div1 {
    	background-color: #00a0e9;
    }
    .div2 {
    	background-color: blue;
    }
    html,
    body,
    .div1,
    .div2 {
        height: 100%
    }
    </style>

    <body>
        <div class="div1">高度全屏</div>
        <div class="div2">第二屏</div>
    </body>

</html>
